feat: Add APP_NAME env support for branding and deployment

- Make app name configurable via APP_NAME env variable - Update UI,
HTML, Docker, scripts, and k8s to use APP_NAME - Add process-html.sh for
template substitution - Document APP_NAME usage in
docs/APP_NAME_CONFIGURATION.md - Update Dockerfile, compose, and scripts
for dynamic naming - Add index.html.template for environment-based
branding

package.json

@@ -1,9 +1,10 @@
 {
-  "name": "rxminder",
+  "name": "${APP_NAME:-rxminder}",
   "private": true,
   "version": "0.0.0",
   "type": "module",
   "scripts": {
+    "predev": "./scripts/process-html.sh",
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",